On that 2nd part, do you mean the actual aircraft battery (not the remote)? There is no way without a charger designed for those batteries, including the connector.
If the charging chord you left at home is the DJI supplied one (the brick with the connector), then your choices are to find a retailer in your travels that has either a) another one of those, and it wouldn't hurt to have two as it will allow you to charge 2 at a time in the future, or b) a third party charger, perhaps one that does 3 batteries at a time, or a car charger (which will work for you now and will also come in handy in the future).
I have both the third party 3-battery chargers as well as a 2-battery car charger, but bought them online. I don't know much about how to find them at retailers while traveling, but I would see if your travels would take me near a Best Buy (or if outside the states, some equivalent).
Chris